Greg (or anyone else) can you comment on why Brianís feet are moving back on his cleans? As I understand it, relatively significant layback can contribute to the whole bar/body system shifting backwards with the feet following. But thereís not much layback going on in Brianís second pull, as his extension seems to be pretty vertical. He also doesnít seem to be sliding his hips forward under the bar or pulling his feet up behind him, both of which I know can contribute to the feet ending up slightly behind. Whatís contributing to his feet moving back and is it a positive or negative sign?

It can also happen when the bar is tugging you forward a bit - so when you pull under, you reach for the bar with your chest, which can have your whole body tilt, bringing the feet back a bit. This is what I would say is happening in the first video - he's not opening up quite enough and his weight stays off balance forward slightly throughout.